555 Code Oscillator (CB26324E)

Found in a 1990s Popular Electronics, this circuit produces a tone on a small speaker. The keyer directly controls the power supply.

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Instrumentation Amplifier (CB4926E)
Using the LT128 and LT1037 from Linear Technology this circuit has a 400 MHz gain x bandwidth...
Crossing Counter (CB17199E)
This circuit can be used for several purposes such as pulse counter, pass counter, roulette, etc....
Sample and Hold LM3900 (CB14218E)
The circuit shown is suggested by National Semiconductor's Linear Applications Handbook. The base...